Change some DCHECK( == 0), to DCHECK_EQ in the posix lock implementation.

base/lock_impl_posix.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/lock_impl.h"
 
 #include <errno.h>
 
 #include "base/logging.h"
 
 LockImpl::LockImpl() {
 #ifndef NDEBUG
   // In debug, setup attributes for lock error checking.
   pthread_mutexattr_t mta;
   int rv = pthread_mutexattr_init(&mta);
-  DCHECK(rv == 0);
+  DCHECK_EQ(rv, 0);
   rv = pthread_mutexattr_settype(&mta, PTHREAD_MUTEX_ERRORCHECK);
-  DCHECK(rv == 0);
+  DCHECK_EQ(rv, 0);
   rv = pthread_mutex_init(&os_lock_, &mta);
-  DCHECK(rv == 0);
+  DCHECK_EQ(rv, 0);
   rv = pthread_mutexattr_destroy(&mta);
-  DCHECK(rv == 0);
+  DCHECK_EQ(rv, 0);
 #else
   // In release, go with the default lock attributes.
   pthread_mutex_init(&os_lock_, NULL);
 #endif
 }
 
 LockImpl::~LockImpl() {
   int rv = pthread_mutex_destroy(&os_lock_);
-  DCHECK(rv == 0);
+  DCHECK_EQ(rv, 0);
 }
 
 bool LockImpl::Try() {
   int rv = pthread_mutex_trylock(&os_lock_);
   DCHECK(rv == 0 || rv == EBUSY);
   return rv == 0;
 }
 
 void LockImpl::Lock() {
   int rv = pthread_mutex_lock(&os_lock_);
-  DCHECK(rv == 0);
+  DCHECK_EQ(rv, 0);
 }
 
 void LockImpl::Unlock() {
   int rv = pthread_mutex_unlock(&os_lock_);
-  DCHECK(rv == 0);
+  DCHECK_EQ(rv, 0);
 }